Kompany's teammate Kevin de Bruyne even went as far as to say he is "okay" with supporters behaving that way. "I've had it a couple of times for my team and it's a nice feeling," he said.

Regardless, the incident is being investigated by Merseyside Police. Superintendent Paul White told BBC Sport that the force "will conduct enquiries to identify who was responsible and bring them to justice."

UEFA, the body that runs the Champions League, has opened its own disciplinary proceedings as well.

Though Liverpool won the first leg, the club still has to contest the second leg at Manchester City on April 10, before the overall aggregate winner can proceed to the Champions League semifinal.